aruco: new feature testCharucoCornersCollinear() in charuco.hpp/cpp
* feature declaration + implementation
* Update charuco.hpp
Fixed parameter listing for Doxygen.
* Updated charuco.cpp
-indentation fixes
-switched order of the test for nCharucoCorners > 2 as suggested
* tests added for testCharucoCornersCollinear T/F
* fixed test to be consistent with C++98